Premium Membership

Learn about power engineering and HV/MV/LV substations. Study specialized technical articles, papers, and electrical engineering video courses.

Electrical books and guides

Electrical engineering is a field of engineering  that generally deals with the study and application of electricity, electronics  and electromagnetism. Many companies and industry experts has been releasing technical books and guides in order to spread their knowledge, so they are all here, presented for you.

Nikola Tesla - Serbian-American inventor, mechanical engineer, and electrical engineer
Nikola Tesla – Serbian-American inventor, mechanical engineer, and electrical engineer

Introduction to energy generation

Prior to the discovery of Faraday’s Laws of electromagnetic discussion, electrical power was available from batteries with limited voltage and current levels. Although complicated in construction, D.C. generators were developed first to generate power in bulk.

However, due to limitation of the D.C. machine to generate voltage beyond few hundred volts, it was not economical to transmit large amount of power over a long distance. For a given amount of power, the current magnitude (I = P/V), hence section of the copper conductor will be large.

Thus generation, transmission and distribution of D.C. power were restricted to area of few kilometer radius with no interconnections between generating plants. Therefore, area specific generating stations along with its distribution networks had to be used.

In later half of eighties, in nineteenth century, it was proposed to have a power system with 3-phase, 50 Hz A.C generation, transmission and distribution networks.

Once A.C. system was adopted, transmission of large power (MW) at higher transmission voltage become a reality by using transformers. Level of voltage could be changed virtually to any other desired level with transformers – which was hitherto impossible with D.C system.

Browse guides and papers

Note that all documents in this section are free to download. Navigate through sub-pages to discover all documents.

Network theorems for electrical engineers (beginners)

This guide will introduce the important fundamental theorems of network analysis. Included are the superposition, ThĂ©venin’s, Norton’s, maximum power transfer, substitution, Millman’s, and reciprocity theorems. We will consider a number of areas of application for… Read more

Released on Jan 23, 2013

Network theorems for electrical engineers - beginners

Earthing of MV/LV Distribution Lines

Figure 1 sets the scene of the environment in which safe power system earthing and bonding is to be achieved. The paper discusses the specific issues Eskom has to take into consideration when making such… Read more

Released on Nov 24, 2012

Principles of Insulation Testing

Most electrical equipment in utility, industrial, and commercial power systems uses either 50 or 60 Hz alternating current. Because of this, the use of an alternating current source to test insulation would appear to be… Read more

Released on Oct 20, 2012

Fluke Multifunction Installation Tester

Medium Voltage Design Guide

In order to design a medium-voltage cubicle, you need to know the following basic magnitudes: Voltage, Current, Frequency and Short-circuit power. The voltage, the rated current and the rated frequency are often known or can easily… Read more

Released on Oct 19, 2012

Medium Voltage Technical Guide // Basics for MV cubicle design – Schneider Electric

The Role of Infrared Testing at Data Centers

The economic impact of downtime at data centers is the highest in the commercial sector. Therefore, the return on investment of predictive maintenance activities, especially infrared, is excellent. These information technology customers want extreme reliability… Read more

Released on Sep 23, 2012

The Role of Infrared Testing at Data Centers

Transformers, Generators and Protection Theory

When we enter into the topic of generator loading we must consider whether or not the connected electrical system is very large and hence strong or smaller and weaker. The first is classed as infinite… Read more

Released on Sep 08, 2012

Transformers, Generators and Protection Theory

High power electronics – HVDC and SVC

The general aspects, including application and build up, of High Voltage Direct Current (HVDC) power transmission systems and Static Var Compensators (SVC) will be described in this chapter. The HVDC and SVC techniques have very… Read more

Released on Sep 08, 2012

High power Electronics - HVDC and SVC

Low voltage protection and control guide

There are 2 types of system equipment, the type that intervenes and the type that does not intervene at the time of a fault. This category comprises all equipment which, due to its function, must… Read more

Released on Sep 07, 2012

Protection and control guide

Elements of Electrical Engineering

Concept of transformation: By the application of Kirchoffs Laws some problems cannot be solved and finds great difficulty due to number of equations. Such problems can be simplified by using star-delta or delta-star transformations. The… Read more

Released on Aug 25, 2012

Elements of electrical engineering (on photo: ABB MACH control and protection system)

Current Transformers Selection Guide

The primary circuits of the current transformer must withstand the constraints related to the medium voltage network to which it is connected. This is the frequency of the installation. A CT defined for 50 Hz… Read more

Released on Aug 25, 2012

Current Transformers Selection Guide

Arc Flash Hazards – LV Circuit Breakers

There are essential requirements for electrical safety. Both domestic and international standards refer to steps and procedures to be taken for protection against hazards from electrical equipment. In particular, high temperatures and electrical arcs or… Read more

Released on Aug 05, 2012

Arc flash in low voltage switchboard cubicle

Roadway Lighting Design Manual

This Roadway Lighting Design Manual has been developed to provide training on the design of roadway lighting systems. Participants will learn the fundamentals needed to design lighting systems. Example problems will help develop the concepts… Read more

Released on Jul 23, 2012

Roadway Lighting Design Manual


  1. Abdulhakeem Dauda
    Aug 11, 2020

    Intrestive and educative want to learn and be a member

  2. med
    Apr 14, 2020

    I would like to thank you all for all this serious and helpful information

  3. dritan
    Mar 17, 2020

    Do you have any vocabulary for technical electric, devices?
    Thank you

  4. tfeld
    Feb 18, 2020

    how do i register?

    • Ahmed Cheikh
      Dec 21, 2020

      How to regist and pay fees

  5. Swapnil Raut
    Jan 07, 2020

    Can you please upload some useful stuff related to Electrical wiring harness and Electrical vehicle as well.


  6. Hein thu
    Nov 14, 2019

    I would like to know about low voltage distibution and protection system

  7. Godswill Essienta
    Aug 18, 2019

    thumbs up

  8. Bazeer Ali
    Aug 01, 2019

    Thanks a lot for your free service(providing free download).

    God bless you.

    Your website helping me/non electrical background persons lot.

    • Edvard
      Dec 14, 2019

      You’re welcome Ali, and thank you for the kind words.

  9. Leslie
    Jun 03, 2019

    Hello to everybody. I want to find a good textbook in English on Power Elecrical Systems for industrial enterprises, the design of power supply systems of industrial enterprises like Boeing, General Motors, Ford, VW, etc. I found some textbooks in Russian (Dr. Konyukhova, Moscow Power Energetic University) but I wish to have textbooks on the same topic by American authors. Who can be recommended?

  10. abhishek chandel
    May 31, 2019

    seriously you are a great man .
    , thank you very much.

  11. abhishek chandel
    May 31, 2019

    great work seriously , thank you very much.

  12. Sonny Abbie
    Jan 29, 2019

    Hi Edvard,

    In street lighting design /or installation? Is the STREET LIGHTING POLE need to be bonded direct to earth for each Pole? is there any specific reference standard?

    please.. provide if there is

  13. Josam Daka
    Nov 29, 2018

    I am looking for sample drawings for Power & Control circuits for a 75kW Soft Starter including PLCs, HMI, Utrasonic level sensors, Utrasonic flow sensors, drive-end and non-drive-end bearing sensors, termistors and associated relays suitable for a Water Pumping Solution

  14. M Iqbal Khan
    Sep 27, 2018

    Dear All,

    I am facing a problem, we have a single 9R32 Wartsila engine and loeri somer alternator. ABB Unitrol 1000-15 A AVR. the generator produces 5.5 kV and then a step up transformer make this 11kv and then step down transformer. the generator trips at overvoltage first stage at 112% at any load during operation.

    Checked following;
    IR for alternator { main stator, main rotor, exciter stator, exciter rotor}
    Diode testing cold and with 24 VDC
    PT IR testing secondary circuit
    resistance with ground
    MCBs replaced
    The star point of the secondary circuit and its grounding.
    the resistance of earting pits
    verified full excitation circuit.
    Everything found normal

    Could anybody help or give an idea or they faced this problem, please respond.

    • Shahrier kabir
      Oct 03, 2018

      please check the varistor if its found okay then tightening the diode and other equipment…..Good Luck

    Sep 11, 2018

    EEP website is doing a wonderful job of providing informative articles to practicing engineers.It is a great effort to keep it going.
    Many Many thanks ,CS Nambisan

    Jun 25, 2018

    This is really useful, thank you team.

    May 22, 2018


  18. moham
    May 09, 2018

    Hello ,
    I already had a request to choose a cylindrical insulator, with the help of your website I made the choice.
    Thank you.

  19. moham
    Apr 24, 2018

    I need guidance to select the cylindrical insulator for the switchgear.
    (Selection with the formula and IEC standard)

    can you help my?
    Thank you
    [email protected]

  20. kamal naser
    Apr 09, 2018

    first of all i want to say thanks for such a nice site
    after that I need an excel calculation sheet for street lighting and park lighting

  21. Zar Ni Thein
    Jul 12, 2017

    Dear Sir/Madam

    Please kindly help me to get IEC standard for my reference. I am looking long time to download for this , but till now i can’t get it.

  22. Paddy Keys
    Jun 28, 2017

    Has anyone have excel software to determine Earth Fault on the network , how different is it to Fault level calc’s

  23. Yogin Rawal
    Jun 12, 2017

    Hello every one,

    Q-1: (a) Can some one provide an example of a “T-Connection” from 220 kV to 220 kV transmission line without any normal/required protection equipment and controls?
    (b) What danger this type of connection poses to the TL and all connected the Substations?
    Q-2: Is there a British Electrical Code gives examption from installing Automatic Fire Protection System? Reference please.

    Thank you,


  24. SABER
    May 04, 2017

    Dear Sir
    i need to know if there are any international stander for the % of spare line “fully equiped with CB” should be kept inside each switchgear ,switchboard and distribution board?
    also the % of space line ” free of devices” should be kept inside each switchgear ,switchboard and distribution board?

  25. Rajesh Kumar
    Apr 29, 2017

    Good post. I am very interested in electrical repairing work and that is why I like to read blogs about electrical work. Keep updating more and also write more on other topics. Because I love this field I do ac servicing work.

  26. Jose Antonio CayĂłn
    Apr 18, 2017

    I would like to know about the Direct Current Motor Starter Design. How do you design the start resistance and the number of them?

    Thank you very much in advance.

    Congratulations for your portal (EEP)

  27. abhijit
    Mar 05, 2017

    Dear sir,

    we have to make contact of switch upto 150A how to select the cross section area for rated current 150A

  28. Chandran C
    Feb 27, 2017

    Thanks for the wonderful tips. We are into home appliance service and blogs like these are very helpful to us. Keep writing more.

  29. Bazic
    Feb 22, 2017

    Thank you so much for your efforts, this website is very useful
    Is it possible to download all documents at once ?


  30. Tran Nguyen Chau
    Feb 15, 2017

    This is the best web site ever for basics of electrical engineering!!

  31. Dharmendra
    Feb 07, 2017

    I have a 150 KVA generator. It suddenly developed a malfunction recently. When it is switched on, it runs for about 30 seconds and then goes off. It is electronically switched on or off.

  32. Muhammad Abbasi
    Jan 09, 2017

    Dear EE Portal,

    Thanks for having such informative website.I am looking for quite long about Electricity metering sp[specifically define kwh meter, var and var hour meter and smart meter.

    If their is any book regarding metering please send me on [email protected]

  33. Ashok
    Dec 13, 2016

    hello sir,

    Please clear my confusion. While calculating load currents for sizing the cables, which P.F.should be used?? Old or new after compensation..? and also i heard that reduced cable size depends on the type of compensation.i.e. global, sector or individual…please explain.

    • Abhiram
      Dec 21, 2016


      If you are talking about XLPE cables, then the power factor to be selected as per the load type. If it is residential, then you can go to 0.8 or below ; if it is commercial/ industrial you have to go to 0.9 or unity (If full motor/ pump loads).
      You can select/ alter the PF as per the local authority approvals only.

      For Fire pumps, large motors & AC units(with motor) always consider starting current as 1.5 times the normal load as standard to size the MCCB/ Isolator rating & then select the cable size accordingly.

      Abhiram Ajay

  34. Sanket Saxena
    Nov 12, 2016

    plz upload any book for practical thinghs mean to say book only linked how to use thinghs pratically which enhance our innovation skills

  35. Krishnan C
    Nov 08, 2016

    I like working on electronics very much. And that is why I have chosen the field of computers and printers. Good post. Keep updating more.

  36. Bipin nena
    Nov 05, 2016

    Dear sir,

    I always learning with EEP, the best site for electrical,
    Sir I want to DOE fundamental of electrical science vol. 2 of 4, hear in site I just see vol. 1 of 4,
    So please can you add in hear. ?

  37. Rizwan Ahmed Rafiq
    Sep 29, 2016

    Can you please explain the function of Load Bank?
    How can we size the Load Bank?

  38. Krunal Shah
    Sep 28, 2016

    How can we upload a video on your this site?

  39. Md. Ashraful Alom
    Sep 05, 2016

    thank you very much

  40. Md. Ashraful Alom
    Sep 05, 2016

    can i get help you for the procedure.

    Aug 19, 2016


  42. Marchester Real Bakah
    Jun 22, 2016

    Can i get help for the procedure for Calculating Three-phase fault current for symmetrical/unsymmetrical systems

    Oct 29, 2015

    I am very pleased to know the difference between symmetrical three phase system and balanced three phase system. Please let me know symmetrical systems and balanced systems.

    Thank you

  44. Javier Mitchell
    Aug 09, 2015

    Hello Engineering Portal Team.
    Congratulations for this wonderful site.
    I have found exactly what I needed.
    Sory I can not donate at this moment, But this
    Engineering portal really deserve a donation just
    as many other wonderful sites on the WEB.
    please dont give up our portal. Keep on.
    Great Thanks to you all.

  45. Anwar Ali
    Aug 08, 2015

    I want to know about the current and voltage role in human body killing (death and electric shuck). I studied many articless/books about it but some are saying current kill people while some are stating voltage. In my opinion it is frequency as in our country frequency is 50Hz and voltage is 220 P-P. It usually kill people while electrocuted. In the country I am working the frequency is 60Hz and the voltage is same 220 P-P and I did not hear that some one electrocuted and died.

    As we go down in reducing frequency the system is going to DC nature which is more danger than AC.

    Please explain so that I can make clear my concept.

  46. Ernest
    May 26, 2015

    Good work

  47. Ernest
    May 26, 2015

    I am electrical engineering student , and i want to know more about power transformers.Thank you for the good job.

  48. Luis Lemus
    Mar 04, 2015

    Good day, first of all i would like to congratulate all of you for such an amazing portal. Contributions are great and i feel like i can keep learning each day a little bit more. I do have one request to make, if possible. I am currently working my thesis and i am interested in power quality for a call center building; specifically i am looking for information about the IEEE.Std. 1100. If you could share something it would be great. Greetings and keep up the great job!!!

  49. Zreik
    Feb 17, 2015

    can u Upload some article about Selectivity for DC Auxiliare low voltage?

  50. Sayed Yusuf Ali
    Dec 25, 2014

    Excellent. Keep it up.

  51. prem
    Dec 06, 2014


  52. SUNIL
    Sep 19, 2014

    Can you upload some article with respect haradous area classification as per IEC 60079. Easy to understand.

  53. Sabariprakash
    Sep 05, 2014

    Hi sir..
    I am having confusion in selection of alternate motor against the installed one.Here i will give the details of installed & alternate motor which i decided for procurement.

    Installed 3 phase Squirrel cage IM:
    Supply Voltage=415v; P=22Kw; Rated Torque=131.7Nm; speed=1468rpm; Frame Size=180L; Rated Current=37.2A(VFD duty Motor); NDE bearings=6210 ZC3 ;DE bearings=6210 ZC3; Cooling Method=IC416 ;

    Proposed 3 phase Squirrel cage IM:

    Supply Voltage=415v; P=22Kw; Rated Torque=143Nm; speed=1473rpm; Frame Size=180L; Rated Current=38A; NDE bearings=6310 ZC3 ;DE bearings=6310 ZC3; Cooling Method=IC411 ;
    Kindly suggest me to procure the proposed one or not and request you to give the detailed articles regarding selection of different motors with known motor.

  54. cameron
    Jun 22, 2014

    Hey guys. I need help on developing a distance relay in Matlab/Simulink. Can anyone perhaps assist me?

  55. Vele
    Jun 19, 2014

    Hi Sir,
    I’d like to know more about earthing transformers and neutral grounding resistors, their applications and why they are required. You have any information on this that can be useful for my project?

    • nbn
      Aug 28, 2015

      Any of the trafo needs to be grounded that is 2 earth pit of neutral earthing & 2 earth pit of body earthing.

      & neutral grounding resistor(NGR) panels are provided in HT DG panels

  56. Chanh
    Jun 01, 2014

    Hi Sir,

    i would like to know how to choose correct capacitor for run or start motor and can i use large or small capacitor than the existing one for motor

  57. vaishnavi
    Feb 14, 2014

    its really very useful
    can u help me in my project tat is gsm based power sharing of transformer with automatic load shedding system. can u give me detailed information about this.

  58. duru jonathan
    Feb 14, 2014

    I want to know more about how to read and solve a fault on electrical diagram.

  59. Leinad
    Oct 13, 2013

    Thank you for the very useful information.

  60. Hariprakash
    Aug 17, 2013

    Hello sir! i feel difficult to understand some concepts of Elec.engg like vector fields in electroagnetic theory,and finding hard to apply in problems,so my request is please make arrangements as these concepts are very important for an Elec.engg students.and also it will be useful for other students.
    I am waiting for your answer

  61. Badam
    Jan 30, 2013

    i am actually working on my project titled electrical design for an office building. I would like to know the recent technology available for cable laying and other safety equipments,

  62. I.P.
    Jan 14, 2013

    Thank You Very Much for this vast collection of resources.
    It’s Very helpful to EE students and licensure exam takers.

  63. ajit.atp
    Jan 13, 2013

    Hello Sir
    I am very much thank ful to you for your information.I hope others also gain knowledge from this.Thank u sir.

  64. ESSA
    Jan 05, 2013

    You are the best Edvard!

    • Edvard
      Jan 05, 2013

      Thanks ESSA, very kind of you!

    Dec 25, 2012


    • Edvard
      Dec 25, 2012

      Thank you! Very kind of you!

        Jan 23, 2017

        I want to know how the master switch wired, hoping your response …

  66. cisnatel
    Jun 19, 2012

    Thank you very much.

  67. Edvard
    May 13, 2012

    Thank you all!!

  68. hamed
    May 12, 2012

    Your great and hard efforts too much appreciated .

  69. Ralvarez
    May 11, 2012

    I would like to thank you all for all this serious and helpful information

  70. lehuan
    May 01, 2012

    Thank you very much.

  71. prodaja
    Apr 26, 2012

    Great work, thank you very much!

    • victor navarrete
      Dec 17, 2019

      thank you very much to guiv me information about electrical engineering, soon i im going to ask about substation equipment testen , like hipot test
      and grounding test

Leave a Reply to Anwar Ali

Tell us what you're thinking... we care about your opinion!

EEP Academy Video Courses

The learning platform for LV/MV/HV electrical engineers. Learn from experienced engineers and sharpen up your knowledge.